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Re: Opening a pty without a process
From: |
Stefan Monnier |
Subject: |
Re: Opening a pty without a process |
Date: |
Tue, 27 Nov 2007 21:21:57 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.50 (gnu/linux) |
>> >> (open-pty-buffer buffer)
-> "/dev/pts/1"
>>
>> How 'bout:
>>
>> (defun open-pty-buffer (buffer)
>> (let* ((process-connection-type 'pty)
>> (proc (start-process "foo" buffer "sh" "-c"
>> "while sleep 3600; do :; done")))
>> (process-tty-name proc)))
> In gdb-mi.el (in ELPA) I do:
> (define-derived-mode gdb-inferior-io-mode comint-mode "Inferior I/O"
> "Major mode for gdb inferior-io."
> :syntax-table nil :abbrev-table nil
> ;; We want to use comint because it has various nifty and familiar
> ;; features. We don't need a process, but comint wants one, so create
> ;; a dummy one.
> (make-comint-in-buffer
> "gdb-inferior" (current-buffer) "sleep" nil "1000000000"))
> and then set the terminal for program IO in GDB:
> (gdb-input
> ;; Needs GDB 6.4 onwards
> (list
> (concat "-inferior-tty-set "
> (process-tty-name (get-process "gdb-inferior")) "\n")
> 'ignore))
> but it seems a bit of a hack
Yes, I guess `sleep' works as well.
>> I guess it would be convenient indeed to be able to use nil for the
>> program rather than a contraption like the one above. OTOH we could
>> just use `hexl' by adding a flag to it (it's already abused in a similar
>> way by `ielm').
> Could ielm use a buffer like the one I'm proposing?
No. It needs "cat" (and used to use "cat").
>> BTW in your patch I do not understand where the create_pty code comes
>> from. It seems to come from Emacs code, in which case it is code
>> duplication and should be avoided.
> It's almost the first half of create_process. Sure it would make sense to
> reuse code once it has been agreed that the function is useful.
Please do that,
Stefan